I've only heard fragments of Blacher's music, but he seems to have been a distinctive and individual voice, and an important teacher of other composers. Quite aside from the specifically music-related topics, I have personal interests in what was going on culturally in Harbin (where Blacher worked) in the 1920s... when Harbin became a centre of "White Russian" culture, for those who had been forced eastwards (voluntarily or otherwise) by the events of the Russian Civil War. I would be fascinated to find out about any cross-fertilisation between the extremely diverse personalities who were working in Harbin at the time (Blacher, Vertinsky, Chaliapine, etc) - although Blacher was actually born in Northern China, so he was a second-generation emigre (I've always presumed him to be the son of German merchant-class family - Germany had whole strings of western-style supermarkets in Far-Eastern Russia and China at this time). [Harbin, btw, is the least Chinese-looking city in China... its city-centre was built up by the Russian emigres, and consists of a huge main shopping street lined by
style-moderne buildings, owned and built by the emigre community. This street was pedestrianised by the Harbin City Administration about 10 years ago and the facades (although not the interiors) of these buildings were substantially restored - despite intensive damage done to them during the Cultural Revolution.]
Blacher seems to have had the singular bad luck to have been repressed by both the Communists (in China) and the Nazis in his native country
I wonder who Blacher's own teachers were? I presume there was an extensive community of artists and musicians (including many jews, who had found fellow-cause with the Whites once Stalin's antisemitic purges began) resident in Harbin, which rivalled only Paris as the home of the Russian-community-in-exile? The story - if there is one? - of Chinese involvement in classical music in Harbin at this time was largely ripped-up by the Cultural Revolution, and getting any information on it now seems a near-impossible task
Although information about the European involvement in Harbin's history is no longer suppressed, it's certainly not a topic which interests the local government. I managed to find a local guide in Harbin who was the granddaughter of one of Denikin's officers who'd avoided capture and fled there, but the information is already third-hand and scanty. The last of the Russian refugees - who were all declared "stateless" and living in abject poverty, not entitled to a pension or any state assistance in China, despite residency since 1922 - died in 1997. We did at least manage to identify the concert-hall of the former "Embassy" of the Russian Government In Exile (later closed-down by the Kuomintang, of course) where Chaliapine had given his concerts. I presume Blacher's music must have been performed there too? The building is now a seedy 2* hotel and the former concert-hall is a grim self-service restaurant. Vertinsky's song "The Sarasaty Romance" is set in the concert-hall, and describes a real-life incident in which Vertinsky found a Romanian violinist (whom he doesn't name) beating-up his own wife backstage after giving an applauded performance of the Romance for the public - the song's ending suggests that Vertinsky then hit the violinist full in the face.